I received a letter from my Doctor today, it is for a fasting blood test, and also an appointment at the surgery diabetic clinic. As I fasting test, I was not surprised at the no food or drink from midnight the night before part, but what does concern me, my appointment is for 5pm. I will have to go 17+ hours with no food or drink, and even if I get into my appointment on time, which is unlikely, I will be without anything, even fluid for a minimum of 17 1/2 hours. I will take a bottle of water with me, but does this sound healthy and right for a diabetic?